I mean literally the same machine as a rock grinder, generated heat and tumbling items smacking into each other.
But like they are soft. And if you don’t use as much heat it is even gentler, which is why the driers that act as a dehumidifier without heat are even better better.






Yup, what other person said, heat pump dryers.
They use the insides of the dryer as the closed loop of heating and cooling. Heating air through clothes to get moisture then cooling it on the other side to condense it. Generates water but doesnt have a vent.
Neat use of the tech.